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Portable Solar Street Lamp PORTABLE SOLAR STREET LAMP ARIFFIN BIN ABDULLAH This thesis is submitted as partial fulfillment of the requirement for the award of the Bachelor Degree Electrical Engineering (Power System) Faculty of Electrical & Electronic Engineering Universiti Malaysia Pahang NOVEMBER, 2008 v ABSTRACT This system is designed for outdoor application in un-electrified remote rural areas. This system is an ideal application for campus and village street lighting. The system is provided with battery storage backup sufficient to operate the light for 10-11 hours daily. The project is about to develop and fabricate the circuit that can charge the lead acid battery during day time by using solar as the source. To control the circuit for charging, I have used the circuit charging that can implement the condition of the charging whether it’s in charging condition of in float condition. When charging condition, red LED will turn on until the battery reach the full charge state that is in floating condition and green LED will turn on. For the switching, I used PIC16F877A to switch on the lamp, by using the photocell sensor. The PIC16F877A will determine whether it is daytime or night time. The light will automatically on when the photocell sensor give the input to the PIC and PIC will give the output to the relay to switch on the light. To control the intensity of the light, we need the other input from the sensor. When sensor detect, PIC will give the output to switch on for the second light. So the intensity of the light will increase and the timing will start counter. After finish the counter, PIC will automatically of the second light. By using this method, its can save the energy that we using from the battery. When night change to the day, photocell sensor detect the ray from the sun, PIC will give the output to off the lamp and the charging circuit will continue charge the battery for the day. vii TABLE OF CONTENT CHAPTER CONTENT PAGE TITLE i DECLARATION ii DEDICATION iii ACKNOWLEDGEMENT iv ABSTRACT v ABSTRAK vi TABLE OF CONTENTS vii LIST OF TABLE xi LIST OF FIGURE xii LIST OF ABBREVIATIONS xiii LIST OF APPENDICES xiv viii TABLE OF CONTENTS 1 INTRODUCTION 1.0 Introduction 1 1.1 Project Overview 1 1.2 Project Aim 2 1.3 Objective 2 1.4 Scope of Project 3 2 LITERATURE REVIEW 2.0 Introduction 4 2.1 Word History Solar Energy 4 2.2 Word History Street Lamp 5 2.3 Solar Energy 7 2.4 Battery Charger 9 3 METHODOLOGY 3.0 Introduction 10 3.1 Hardware Configuration 11 3.1.1 Circuit Diagram 11 3.1.2 Charging Circuit 12 3.1.3 Charging Operation 13 3.1.3.1 Schottky Rectifier 15 ix 3.1.4 Control Circuit 17 3.1.4.1 PIC16F877A 18 3.1.4.2 Photocell Sensor 20 3.1.4.3 Wave Sensor 21 3.1.4.4 Relays 22 3.1.4.5 12V Lead Acid Battery 23 3.2 Software Configuration 24 3.2.1 Software Programming 24 4 RESULT AND ANALYSIS 4.0 Introduction 25 4.1 Estimation Time 26 4.2 Calculation 27 4.2.1 Charging 27 4.2.2 Discharging 28 4.3 Graph of Charging 29 4.4 Graph of Discharging 30 4.5 Cost of the Project 31 4.6 Commercializes 32 5 CONCLUSION AND RECOMMENDATIONS 5.0 Project Problem and Solution 33 5.1 Future recommendations 34 5.2 Conclusion 35 x REFERENCE 36 APPENDIX A 37 APPENDIX B 38 APPENDIX C 40 APPENDIX D 41 CHAPTER 1 INTRODUCTION 1.0 Introduction This chapter describes about the project’s introduction. It consists of overview of the project, the project aim, objectives and scopes of the project. 1.1 Project Overview This project is about to develop and fabricate the circuit that can charge the lead acid battery when in day by using solar as the source. To control the circuit of the charging, I used the circuit charging that can implement the condition of the charging whether its in charging condition of in float condition. When charging condition, red LED will turn on until the battery reach the full charge that is in floating condition, when floating, green LED will turn on. For the switching to the load, I used PIC16F877A to switch on the lamp, by using the photocell sensor and relay 5V, the PIC16F877A will determine whether is in daylight or in night by determination of ADC in that come from the photocell sensor. The value to determine the intensity of the light we had set up it into the coding of the PIC. When PIC gets the input from ADC, PIC gives the output to the relay to switch on the light. To control the intensity of the light, we need the other input from the sensor 2 that is wave sensor. When wave sensor detect that have some wave from the user of the road, PIC will give the output to switch on for the second light. So the intensity of the light will increase and the timing will start counter. After finish the counter, PIC will automatically switch off the second light. By using this method, its can save the energy that we using from the battery. When night change to day, photocell sensor detect the ray from the sun, PIC will give the output to switch off the lamp and the charging circuit will continue charge the battery for the day. 1.2 Project Aim The solar street lamp is designed specifically for portable use at the rural areas and energy backup if disaster happens. It’s also as the new way to save the energy and use it more efficiently. 1.3 Objective The main objective of this project is to develop the portable solar street lamp with the DC voltage as the source. There are two secondary objectives to be achieved in order to achieve the main objective stated above. The two secondary objectives were discussed in the following paragraph. The first objective is to develop the charging circuit that can charge 12V lead acid battery by using the solar panel as the DC source. This charging circuit can implement the charging condition as we know we have several charging condition like charging condition and floating condition. The second objective is to design and program the control circuit by that contain of PIC16F877A to control the circuit to switch on and off the lamp when the situation change like from the day to night. This circuit also to control the intensity of the light 3 that can improve the efficiency of using the DC energy that only use when need.(e.g. when nobody use the road, this portable solar street lamp just switch on with the low intensity of the lamp that’s can save the energy and when its detect that have the user, this solar street lamp will switch on the high intensity lamp to beam the place for the users) 1.4 Scope Of The Project The scope of the project includes construct the circuit in order to charge the 12V lead acid battery. The acid battery will supply power to switch the lamp when there is no light or night condition. Integration between sensor and wave sensor was also concentrated in development of this system. In order to control the circuit for switching the PIC16F877A was developed. Finally, the system was combined together to complete the development of the system CHAPTER 2 LITERATURE REVIEW 2.0 Introduction In this chapter, explanations about all the word history and literature review. The total figure related to this project will be added in this chapter along with the details. Word History 2.1 Solar energy Solar energy is the light and radiant heat from the Sun that influences Earth's climate and weather and sustains life. Solar power is sometimes used as a synonym for solar energy or more specifically to refer to electricity generated from solar radiation. Solar radiation is secondary resources like as wind and wave power, hydroelectricity and biomass account for most of the available flow of renewable energy on Earth. Solar energy technologies can provide electrical generation by heat engine or photovoltaic means, space heating and cooling in active and passive solar buildings; potable water via distillation and disinfection, day lighting, hot water, thermal energy for cooking, and high temperature process heat for industrial purposes. 5 Solar energy refers primarily to the use of solar radiation for practical ends. All other renewable energies other than geothermal derive their energy from energy received from the sun. Solar technologies are broadly characterized as either passive or active depending on the way they capture, convert and distribute sunlight. Active solar techniques use photovoltaic panels, pumps, and fans to convert sunlight into useful outputs. Passive solar techniques include selecting materials with favorable thermal properties, designing spaces that naturally circulate air, and referencing the position of a building to the Sun. Active solar technologies increase the supply of energy and are considered supply side technologies, while passive solar technologies reduce the need for alternate resources and are generally considered demand side technologies. 2.2 Street Lamp Before we have incandescent lamps, gas lighting was in use in cities. The earliest of such street lamps were built in the Arab Empire, especially in Cordoba, Spain. The first electric street lighting employed arc lamps, initially the 'Electric candle', 'Jablochoff candle' or ‘Yablochkov candle’ developed by the Russian Pavel Yablochkov in 1875. This was a carbon arc lamp employing alternating current, which ensured that the electrodes burnt down at the same rate.
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